I too am an anxious person and I believe I burn my calories too just worrying about this and that! I was diagnosed with "generalized anxiety disorder" when I was about 21. It's very stable now as I just worry about stupid things like catching the stomach bug or driving far distances or snow! I've pretty much learned to control it so it doesn't turn into panic(thank goodness).
You and I are so much alike it's scary. When my weight does go down I too weigh myself 3 times a day. WE even have a stupid scale in work that I catch myself on when I'm down on my weight! I believe the fact though the more you obsess about it the more you'll lose. I finally stopped weighing myself this last bout and lo and behold I started to gain a pound at a time back.
I'd give everything to have a shake each night before bed but I am sooooo afraid to even try ice-cream ever again. My sister tried the lactaid and said it didn't work for her. I really should just try it or some type of soy milk but I'm so chicken! I need to just bit the bullet!